Next, I want more fine grained zooming with + and - than the default 25%, so I’ll set it to 10%

;; more fine-grained zooming(setq pdf-view-resize-factor 1.1)

Finally, for my most commonly used annotation tools (adding a highlight, adding a text note and deleting an annotation), I want quicker shortcuts. With the following I just hit h, t or D respectively for those tools (instead of e.g. C-c C-a h to highlight).